#include "stdio.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

#define FLUSH_LINE 2
#define LINE_SIZE 1024

struct _myFILE
{
  unsigned int flags;
  int fileno;
  //缓冲区
  char cache[LINE_SIZE];
  int cap;
  int pos;//下次写入位置

};
typedef struct  _myFILE myFILE;

myFILE* my_fopen(const char *path, const char *flag);
void my_fflush(myFILE *fp);
ssize_t my_fwrite(myFILE *fp, const char *data, int len);
void my_fclose(myFILE *fp);

